.grand {
    width: 200px;
    height: 400px;
    background: orange;
}

.father {
    width: 200px;
    height: 250px;
    background: skyblue;
    margin-top: 140px;
}


.son {
    width: 200px;
    height: 100px;
    background: pink;
    margin-top: 130px;
}